Shading-machine.



W. H. MARGETTS.

SHADING MACHINE.

APPLICATION FILED 050.29. 1915.

Patented Nov. 7, 1916.

'IT STAEES ATE QFFXQ SHADING-MAGI-IINE.

Specification of Letters Patent. 7

Patented-Nov. .7, 1916.

Application filed December 29,1915. Serial No. 69,287.

To all whom it may concern:

Be it known that 1," WILLIAM HENRY MARGETTS, a' subject of the King of Great Britain, residin in the city of Toronto, county of Yor Province of Ontario, Canada, have invented certain new and useful Improvements in Shading-Machines, of which the following is a specification. My invention relates to improvements in shading machines, and relates more particu: larly to the production of a shading machine used in connection with lithography, zincology and photo engraving, andthe objects of my invention are first,to construct a readily portable machine of this class so that no difiiculty at all will be experienced in shifting the machine where ever desired; second, to construct my machine so that the same may be adjusted to difierent thick-- nesses of stone when the same is used in lithography; third, to make my machine operatively heavy so that there will be no danger of the same being inadvertently shifted, thus insuring that the film will always be held in the desired place; fourth, to construct my machine so that the film carried thereby may be moved as desired, and fifth to construct my machine as cheaply as possible without danger of sacrificing efliciency. a

Figure 1 is a plan view of my machine in its preferred construction, showing a portion of a film and portion of a frame therefor with the machine. Fig. 2 is an end elevation of the machine, and Fig. 3 is a vertical cross section on the line 83, Fig. 1.

In the drawings, like characters of reference indicate corresponding parts in each figure. 7 u

My preferred form of machine comprises a back plate A which extends substantially for the full length of the machine, and preferably integrally formed with said back plate, and projectingbeyond the front side thereof, are bearing blocks B, which are p0 sitioned near each end of said back plate. Integrally formed with the back plate A or separately formedtherefrom, asin the construction illustrated, are end plates 0 with each of which are preferably integrally formed a pair of sockets D. l The said sockets are positioned one at each end of the said end plates 0. I prefer to extend the ends 1 of the back plateA so that they will overlap the plates C. Accordingto my preferred form of construction the end plates C and back 'plate A are supported upon a bottom plate E, which is preferably quite thin. The screws F pass through the plates E and O and through the lugs G forming part of the ends 1 of the back plate A. The said-screws F also pass through the hOIlZOIltELl ends H of the handle I, and as the upper ends are threaded, nuts J are screwed on said upper ends, thus binding allthe parts just mentioned firmly together. The undersides of the bearing blocks B, as shown at 2 are positioned above the bottom plate E far enough to permit the platform 3 of the sliding plate 4 to slide thereunder as illustrated in Figs. 1' and 3. The said sliding plate operates against the bottom plate E.

Preferably integrally formed with the sliding plate 4 is a coupling block v5 provided with holes 6 through which pass coiled springs 7. These springs also pass through holes 8 formed in the back plate A. The said springs are secured in place by any suitable means. As illustrated the ends of the said springs project through the block 5 and back plate A, and are passed through any suitable means such as washers 9 which hold them in place. '10 is portion of a film mounted in the usual mannerin a suitable frame 11, portion of which is shown. Any suitable coupling meansmay be used to couple the frame 11 to the shading machine through the medium of the sliding plate 4. My preferred means for this purpose is as follows:-

12 is a bar preferably made of metal, and the same is provided with threaded coupling means 13 such as screws passing therethrough and screwinginto the frame 11. At each end of the bar12 is formed a pocket 14 in each of which is held the hooked end 15 of the spring arm 16 which are coupled to the platform; 3 by any suitable means, for ex ample, screws 17 tapped into the platform 3,

and provided with washers 18 which are jammed against the looped inner end 19 of each spring arm through which looped inner ends the screws 17 pass. The looped inner ends 19 are preferably connected to gether by the bar 20, or some equivalent construction which will assist to hold them in place.

Without "further description the v manner in which the frame 11 is pivoted to the machine will be thoroughly understood upon reference to Figs. 'l and 2.

(t represents the surface of the lithographing stone, for instance.

IVhen the artist desires to inspect the surface of the stone, for example, upon which he is transferring the ink from the film 10, all that is necessary for him to do so is to move the frame 11 up into the dotted position shown in Fig. 2. Should it be necessary for him to re-ink any portion of the surface of the stone, by moving the frame back into position, all points of the film 10 will coincide with the points of the wrface of the stone (6 already inked so that the faintly inked parts may be better inked.

The following preferred means I use to adjust the position of the frame 11 through the medium of the sliding plate 4: Threaded through preferably metal bushings 21 mounted in the back plate A and the bear ing blocks B, are adjusting screws comprising threaded stems 22 threading through said bushings. Carried at the inner end of each threaded stem is a disk 23, and each disk is provided with a suitable graduated scale, bearing appropriate markings, for example, each disk may be marked from zero up to nine. Should it be desired to shift the film 10 to the left a certain distance, the threaded stem Z) will be turned to withdraw the disk carried thereby from its associated end of the coupling block 5, and then the threaded stem 0 will be turned the desired distance to shift the sliding plate 4 and the frame 11 the desired distance to the left. The threaded stem 2) will then be turned to place this disk against the coupling block 5. The artist of course will keepnote of the distance the frame 11 has been shifted and if he wishes to'shift the same to the right, he can do so by the means just described, and he can return the frame 11 to the exact position in which it was before shifted.

By means of the threaded stems 22 and their associated disks carried in the back plate A, the position of the sliding plate 4:

can be adjusted backward or forward the required degree, and so correspondingly adjust the position of the frame 11.

The springs 7 are designed to be always under tension, and so consequently they will hold the coupling block 5 against the disks carried by the threaded stems mounted in the back plate A. V r

In case some users of this machine desire to clamp the sliding plate 4 firmly in adjusted position, I provide internally threaded sockets 0 carried by the bearing blocks B, and mount in the socket set screws d which can be jammed against said sliding plate.

My machine while constructed so as to .be readily portable, will be made heavy enough so that when once placed in position it cannot be inadvertently shifted, with the result that when the film is properly adjusted, there will be no reasonable danger of the same being thrown out of adjustment through movement given to the machine.

In Fig. 2 I illustrate my machine as used 011 the top surface of a lithographic stone for example. Now if it is desired to use the machine at one side of the lithographic stone, for example, the same is supported on a suitable stand, and to bring the bottom of the plate E in the same plane as the top of the stone and support it in this position, I utilize the postse slidably mounted in the sockets D. When the desired adjustment of the machine has been secured, the set screws 7" are used to lock the posts 6 in the sockets D. The outer ends of the threaded stems 22 are suitably shaped so that a suitable key may be fitted thereon to permit of the movement thereof.

' By providing the plate E or its equivalent, the sliding plate a may be moved without danger of scratching or marking the surface of the lithographic stone, for example, in case the machine be placed on the surface of the stone.

lVhile I have described what I consider to be the best embodiment of my invention, I desire it to be understood that principle can be embodied in different forms, and I desire not to be limited beyond the requirements of the prior art and the terms of my claims.

What I claim as my invention is:

1. A machine of the class described comprising a suitable frame; a sliding plate mounted in said frame; means for adjusting the position of said sliding plate longitudinally and transversely in respect of said frame, elastic means associated with the said sliding plate and said frame'which operates to hold said sliding plate in its transversely adjusted position, and means carried by said sliding plate whereby a frame provided with a film may be hinged thereto.

2. A machine of the class described comprising a suitable frame; a bottom plate secured to said frame; a sliding plate mounted in said frame, and upon said bottom plate; means for adjusting the position of said sliding plate longitudinally and transversely in respect of said frame, elastic means associ ated with the said sliding plate and said frame which operates to hold said sliding plate in its transversely adjusted position, and means carried by said sliding plate whereby a frame provided. with a film may be hinged thereto. V

3. A machine .of the class described com- 5 prising a suitable frame, a bottom plate secured to said frame; a sliding plate mounted in said frame and upon said bottom plate; means for adjusting the position ofthe said sliding plate longitudinally and transversely 4. A machine of the class described comprising a suitable frame; a bottom plate secured to said frame; a sliding plate mounted in said frame and upon said bottom plate; means for adjusting the position of r the said sliding plate in said frame; a pair of coiled springs coupling said sliding plate to the back of said frame; means carried by said sliding plate whereby a frame provided with a film may be hinged thereto, and posts adjustably mounted one at each corner of said frame whereby the height of said frame may be adjusted.

5. A machine of the class described comprising a back plate integrally provided at each end with bearing blocks; end plates,

and a bottom plate extending for the full length and width of the machine; means whereby said back plate and end plates and bottom plate are secured together; a sliding plate comprising a platform designed to operate upon said bottom plate and at Copies of this patent may be obtained for five cents each, by addressing the Washington, 1H3.

each end underneath said bearing blocks; a coupling element carried by said sliding plate; means for adjusting the position of said sliding plate comprising threaded stems each provided at its inner end with a disk; certain of the threaded stems designed to be held in said bearing blocks at each end of said coupling element to transversely adjust the position of said sliding plate; certain of said threaded stems designed to be held in said back plate to adjust the forward and backward movement of said back plate, and springs whereby said sliding plate is coupled to said back plate, as set forth.

6. A machine of the class described comprising a suitable frame; a sliding plate mounted in said frame;means for adjusting the position of said sliding plate longitudinallyv and transversely in respect of said frame and elastic means associated with the said sliding plate and said frame which operates to hold said sliding plate in its transversely adjusted position.

In testimony whereof I have aflixed my signature in presence of two witnesses.

WILLIAM HENRY MAneETTs.

Witnesses:

EGERTON R. CASE, 0. M. BURKINSHAW.

Commissioner of Patents, 

